Everyone's stomach is as big as their own hand.
7-9 year olds use a 11inch ball 10-12 year olds use a 12inch ball
Depends, I guess. :)
Small
Whatever size it happens to be, they are all different.
roughly 8.8"
Try Nerf footballs
13 inches
Between the ages of 10-12 the average size of a male brain is 1,440 grams and the average size of a female brain is 1,260 grams. The size of a nine year olds brain is only slightly smaller.
About in a girls size, a 4. In a boys size, a 5.
12" balls i believe
The average hand size for a ten year old girl is typically around 5.5 to 7 inches in length from the base of the palm to the tip of the middle finger and 2.5 to 3.5 inches in width across the palm. Keep in mind that hand size can vary based on factors such as genetics and individual growth patterns.
A 4/4 cello is a full size, usually 12-13 year olds to 30-40-50 year olds depending on how big you are.